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WM_SETREDRAW Overview  Group

An application sends the WM_SETREDRAW message to a window to allow changes in that window to be redrawn or to prevent changes in that window from being redrawn.


wParam = (WPARAM) fRedraw;  // state of redraw flag 

lParam = 0;                 // not used; must be zero 



Value of wParam. Specifies the state of the redraw flag. If this parameter is TRUE, the redraw flag is set. If the parameter is FALSE, the flag is cleared.

Return Values

An application should return zero if it processes this message.


This message sets or clears the redraw flag. If the redraw flag is cleared, the content of the given window is not updated after each change, and the window is not repainted until the redraw flag is set. For example, an application that must add several items to a list box can clear the redraw flag, add the items, and then set the redraw flag. Finally, the application can call the InvalidateRect function to cause the list box to be repainted.

See Also


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